Magneto electric ignition apparatus, especially for internal combustion engines



Get. 29, 1935. J. BOHLI 2,018,830

MAGNETO ELECTRIC IGNITION APPARATUS, ESPECIALLY FOR INTERNAL COMBUSTION ENGINES Filed JulyS, 1953 5 Sheets-Sheet l Jnren/an Oct. 29, 1935. J BOHLI 2,018,830

MAGNETO ELECTRIC IGN ITION APPARATUS, ESPECIALLY FOR INTERNAL MBUSTION ENGINES 1935 3 Sheets-Sheet 2 Filed y a,

'I/I/III/II 0a. 29; 1935. J BOHL. 2,018,830

MAGNETO ELECTRIC TION APPARAT ESPECIALLY FOR IN N COMBUSTION E NES e uly 3, 1933 3 Sheets-Sheet 3 Patented Oct. 29, 1935 MAGNETO ELECTRIC IGNITION APPARA- TUS, ESPECIALLY FOR INTERNAL COM- BUSTION ENGINES Jakob Bohli, Solothurn, Switzerland, assignor to Scintilla Societe Anonyme, Soleure, Switzerland Application July 3, 1933, Serial No. 678,899 In Germany July 4, 1932 3 Claims.

The present invention relates to magneto electric ignition apparatus as used for ignition systems in which more than one spark plug per cylinder is employed. In such cases it is very important that the ignition systems are magnetically and electrically completely independent of each other and that the apparatus used in this case have as small overall dimensions and weights as possible.

According to the invention ignition systems completely independent of each other and arranged around a central and common drive shaft are provided, whilst the primary contact breakers needed in these systems are operated by a cam mounted on said drive shaft or by cams driven off said drive shaft by means of a set of spur wheels and the high tension distributor members are directly coupled to said cam or cams.

On the drawings various examples of the object of the invention are illustrated. Two ignition systems are provided which supply independently of each other the necessary current to the two spark plugs per cylinder.

Fig. 1 is a vertical section of the ignition apparatus in which the breaker cam which operates the two breaker mechanisms is. mounted on the drive shaft and in which on the breaker cam the high tension distributor member is mounted cams being driven of! the commondrive shaft bymeans of intermediate 'gearings.

Fig. 3 is a horizontal section on line X--X of Fig. 2.

Fig. 4 is a vertical section through the breaker mechanism driven directly of! the internal combustion engine, one breaker cam being provided operating 2 breaker mechanisms and to said breaker cam one high tension distributor memher being fixed containing two separate electrodes.

Fig. 5 is a vertical section through the ignition apparatus which is operative in connection with the breaker mechanisms as shown in Fig. 2.

a is the bearing bracket of the apparatus for the drive shaft b which drives by means of the three gear wheels 0, d, e the two permanent magnets 1 and a. h and i are the two ignition coils which are magnetically and electrically completely independent of each other. 1 is the breaker cam arranged on the shaft 1: which is fixed to the drive shaft b and this cam is adapted to 09- and p insulated from one another.

erate the two primary breaker mechanisms. In Fig. 1 one breaker mechanism Only is illustrated. The high tension distributor member 11 is fixed to the end of the cam l and has two electrodes 0 The coil 1 supplies high tension current to the electrode 0 by means of the cable 8 and the carbon brush 1, the coil h supplies the current to the electrode p by means of the cable t, contact ring u and carbon brush q. According to this constructional form the breaker cam is provided on a shaft which is fixed to the drive shaft D. But it is in the scope of this invention to provide for each ignition system separate breaker cams and separate high tension distributor members which are 1 driven directly off the rotating permanent magnets 9 and f not shown on the drawing or by means of additional intermediate members which are driven oil the drive shaft b as shown in Figures 2 and 3. In this arrangement a spur wheel c is fixed to the drive shaft b engaging the wheel d, e respectively; on the wheel d the cam l and on the wheel e the cam l" are disposed; each of these cams operates the breaker mechanism and to the cams l', l" the distributor memthe high tension distributor member 11 enclosed in a separate casing and these members are driven directly oil the internal combustion engine. The ignition apparatus is shown in Fig. 5, comprising the rotating permanent magnets f, g and the coils h, i.

The object of the present invention allows the 4 two ignition systems to be completely independent of each other and this for the smallest weights and overall dimensions which are attainable.

What I claim is: 4

1. In a magneto electric ignition apparatus in combination a drive shaft, a spur wheel fixed to the end of this drive shaft, rotating permanent magnets arranged around said drive shaft and parallel to the same, spur wheels one for each of and fixed to the same, one breaker cam fixed g5 to the free end of said spindle, a bearing bracket for said drive shaft, a casing enclosing the said permanent magnets, said gear wheels and said coils, a cover for said casing forming a cavity towards the outside, two breaker mechanisms arranged in said cavity, a high tension distributor member fixed to the breaker cam,-two electrodes cast into the latter and insulated of each other, a carbon brush slidably arranged in said distributor member and in contact with one of said two electrodes, a cover for closing said casing cover, electrodes cast into the latter cover for the high tension cables, a central carbon brush provided in said last mentioned cover and in contact with one of the two electrodes of the distributor member, a contact ring fixed to the latter cover and arranged so that it is adapted so that the carbon brush of the distributor member slides upon it.

2. In a magneto electric ignition apparatus in combination a common drive shaft, a spur wheel fixed to the end of said drive shaft, rotating permanent magnets arranged around said drive shaft and parallel to the same, spur wheels one for each of said permanent magnets and fixed to the latter, ignition coils, one for each of said permanent magnets and arranged coaxially with respect to the latter, breaker cams, one for each ignition system and driven off the said common drive shaft by means of intermediate members, a bearing bracket for said drive shaft, a casing enclosing said permanent magnets, said gear wheels and said coils, a cover for said casing forming a cavity towards the outside, breaker mechanisms, one for each ignition system arranged in said cavity, high tension distributor members, one for each ignition system fixed to said breaker cams, electrodes one for each of shaft and parallel to the same, spin wheels, one 10 for each of said permanent magnets and fixed to thelatter, ignition coils, one for each of said permanent magnets and arranged coaxially with respect to the latter, one breaker cam arranged independently of the ignition apparatus and 15 driven directly off the internal combustion engine, a bearing bracket for said drive shaft, a casing enclosing said permanent magnets, said gear wheels and said coils, a cover for said casing, two

breaker mechanisms arranged independently of 20 the ignition apparatus and operated by said cam, a high tension distributor member fixed to said cam, a casing for said breaker cam and said high tension distributor member, two electrodes cast into the latter, a carbon-brush slidably arranged u in said distributor member and in contact with one of said two electrodes, a cover for said lastmentioned casing, electrodes cast into the latter for the high tension cables, a central carbonbrush provided in the last-mentioned cover in contact with one of the two electrodes of the distributor member, a contact ring fixed to the latter cover and so arranged that the carbon-brush of the distributor member slides upon it, a cover containing electrodes for the high tension cables, '5:

carbon brushes provided in said cover for the distributor members.

J AKOB BOHLI. 

